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131 lines
4.4 KiB
131 lines
4.4 KiB
/**************************************************************************** |
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* fs/fs_openblockdriver.c |
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* |
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* Copyright (C) 2008 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in pathname and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of pathname code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <sys/types.h> |
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#include <sys/mount.h> |
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#include <debug.h> |
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#include <errno.h> |
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#include <nuttx/fs/fs.h> |
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#include "fs_internal.h" |
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/**************************************************************************** |
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* Private Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Public Functions |
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****************************************************************************/ |
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/**************************************************************************** |
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* Name: find_blockdriver |
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* |
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* Description: |
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* Return the inode of the block driver specified by 'pathname' |
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* |
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* Inputs: |
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* pathname - the full path to the block driver to be located |
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* mountflags - if MS_RDONLY is not set, then driver must support write |
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* operations (see include/sys/mount.h) |
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* ppinode - address of the location to return the inode reference |
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* |
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* Return: |
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* Returns zero on success or a negated errno on failure: |
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* |
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* EINVAL - pathname or pinode is NULL |
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* ENOENT - No block driver of this name is registered |
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* ENOTBLK - The inode associated with the pathname is not a block driver |
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* EACCESS - The MS_RDONLY option was not set but this driver does not |
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* support write access |
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* |
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****************************************************************************/ |
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int find_blockdriver(FAR const char *pathname, int mountflags, FAR struct inode **ppinode) |
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{ |
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FAR struct inode *inode; |
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int ret = 0; /* Assume success */ |
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/* Sanity checks */ |
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#ifdef CONFIG_DEBUG |
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if (!pathname || !ppinode) |
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{ |
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ret = -EINVAL; |
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goto errout; |
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} |
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#endif |
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/* Find the inode registered with this pathname */ |
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inode = inode_find(pathname, NULL); |
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if (!inode) |
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{ |
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fdbg("Failed to find %s\n", pathname); |
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ret = -ENOENT; |
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goto errout; |
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} |
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/* Verify that the inode is a block driver. */ |
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if (!INODE_IS_BLOCK(inode)) |
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{ |
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fdbg("%s is not a block driver\n", pathname); |
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ret = -ENOTBLK; |
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goto errout_with_inode; |
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} |
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/* Make sure that the inode supports the requested access */ |
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if (!inode->u.i_bops || !inode->u.i_bops->read || |
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(!inode->u.i_bops->write && (mountflags & MS_RDONLY) == 0)) |
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{ |
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fdbg("%s does not support requested access\n", pathname); |
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ret = -EACCES; |
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goto errout_with_inode; |
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} |
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*ppinode = inode; |
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return OK; |
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errout_with_inode: |
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inode_release(inode); |
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errout: |
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return ret; |
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}
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